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A computer lets you make more mistakes faster than any invention in human history - with the possible exceptions of handguns and tequila.
The bitterness of poor quality remains long after the sweetness of low price is forgotten.

Well, that's what I did try first, also, just erased the drive to see if that would make it two..., but as far as I understand, it will partition the two drives still in a raid 0 set, means half and half twice. Actually, right now I have four partitions on it.
I just don't get you, partitions and physical drives are in my opinion two different things, isn't that so???

What tool did you use to create the RAID 0 initially ?
I assume you need the same tool to undo the RAID ( un-group )

Then you will have 2 separate disks in Disk Utility and you can start creating partitions on each of them.

Cheers ... McBie

A computer lets you make more mistakes faster than any invention in human history - with the possible exceptions of handguns and tequila.
The bitterness of poor quality remains long after the sweetness of low price is forgotten.